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[Snort-users] tcp_decode logging

from [vulnerable] Network Security [Permanent Link]
Subject: [Snort-users] tcp_decode logging
Date: Thu, 13 Apr 2006 11:43:51 -0700 
Recently i've been recieving lots of 'tcp experimental options' alerts
through the tcp_decoder.

I am using barnyard w/ unified logging however the tcp options are not
being logged.  Is this by design?  I can't find any firm answers.  I'd
like to enable this if I can.

And since this isn't being logged I can't find the cause,  I'm
assuming it's a false positive though.  Random packet captures show
the options such as:

| 02 04 05 78 01 01 04 02 4c 0a 00 40  01 01 0a 70 01 1e 00 05 01 00  |
which ethereal decodes as MSS 1400 NOP NOP SACK Unknown 0x4c NOP EOL

But I'm only assuming this is the bad packet since none of the flagged
packets are being logged by snort...

Is it recommended that I disable this alert w/ config
disable_tcpopt_experimental_alerts?  Still, I'd prefer to fix or
understand the issue before disabling the alert.  What are the general
causes of these experimental options?

tia


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